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Its usualy not the sensors since they have heating elments built in. Its that the cats do not get hot enough to remove enough NOX from the exhaust stream to give the o2 sensor A proper reading . Cats only work if they get to a certain temperature. Usually the EGTs leaving the cat are higher than...

In NYS you will have issues with some aftermaket cats setting readiness mode and triggering o2 CELs. I guess these kooks green headers are the exception. Maybe others will not have an issue but Its probably more of a guessing game. I'm assuming you can remove the o2s with a tune yes? I have...

Yea if they are US made, I'd pay a few bucks extra for them. I'm pretty sure the JBA/BBK ones are not US made. So basically the lifetime warranty is an extra $250 for the same header? Any reports on cracking on these things?

I didn't really know much about these headers. I suppose if I could get them for under $900 shipped I would consider it. Looks like I would spend about $800 shipped for the JBA headers and xpipe. Deff not a bad option. I suppose these or Chinese made as well?

That's interesting. Is the "JBA speedshop" the people that used to make the jba headers? Apparently JBA is a brand owned by a company called pertronix which I have never heard of. Maybe that shop sold the JBA brand to pertronix.

I been looking at getting headers but it seems ridiculous to spend close to $2k on them. I have had luck with JBA products in the past on other vehicles and was satisfied with the quality. I contacted JBA via email and they claim that their headers are available with the x-pipe/h-pipe lead...

new here, not new to tuning however. I'm interested in starting to tune this vehicle myself as well. You bring up some interesting points for sure. I have found this to be the case in many other platforms as well especially VWs/Audis. No one shares any info on how to tune some of the newer audis...

yea something different for sure. I have had too many 4 banger turbos that it starts just get repetitive after a while. Downpipe, tune, fmic, injectors, race gas, e85 etc. Same song and dance lol.

I still have my b5 s4 buts been down for a while. I love this car so far. First domestic i have ever owned. I had mostly audis and VWs. I had a mk6 golf r before this.

Just got my car last sunday. Located in Chappaqua.